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ATOM

The atom and its particles

TermDefinition
Atomic number Number of protons in the nucleus
Mass number Number of protons plus neutrons in the nucleus
Atom The smallest particle of a chemical element that can exist
Proton A stable subatomic particle with a positive electric charge equal in magnitude to that of an electron
Neutron A subatomic particle of about the same mass as a proton but without an electric charge
Nucleus The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
Subatomic particles Particles that are smaller than the atom. The three main subatomic particles that form an atom are protons, neutrons, and electrons
Electron shell A grouping of electrons surrounding the nucleus of an atom
Isotope Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
Ion An electrically charged atom or group of atoms formed by the loss or gain of one or more electrons
Created by: Evafq
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